I could be wrong here, but when I read PF's original post, my take was that with the AOW, you usually get the deep dive cert, so you would understand it's much more involved that diving 60'.
I've been to 70' a couple of times, and was uncomfortable only because "am I not going to do something right during ascent." I've not had any problems as long as I stay with the NDL. But a couple of guys I dove with wanted to do 100' and I begged off.
The certification is irrelevant in itself. If an OW diver on that boat had 200 dives, and never was below 70ft, IMHO, they are crazy to go to 130ft and depend on the DM's guidance. Man....if we were talking cenotes here, people would be all over you! I know from experience....
I'll take the training and make sure that I know what I'm doing, prior to making that venture. Alot of people think I'm crazy already....no sense proving them correct!
Jack